> ## Documentation Index > Fetch the complete documentation index at: https://docs.ornn.com/llms.txt > Use this file to discover all available pages before exploring further. # Choose a VM disk > Saves the disk Ornn boots when it creates this reservation's VMs. Saving a disk does not launch anything. You can change the choice until the reservation is activated; after activation the disk is locked. Send null to clear the choice, in which case activation uses your organization's newest disk, or an Ornn disk if your organization has none. Ornn checks that your organization can use the disk when it creates the VM. Bare Metal, Kubernetes, and Slurm reservations do not use a VM disk. Copy a disk ID from **Disks** in the console, or list your disks with `GET /v1/orchestrator/disks` and use an entry's `id`. The CLI does not set reservation disks. For the full flow, see [Use the API](/guides/vm-access#use-the-api). ## OpenAPI ````yaml openapi.yaml PUT /commerce/reservations/{reservationId}/disk openapi: 3.1.0 info: title: Ornn compute API version: 1.0.0 description: >- Customer HTTP API for Ornn GPU capacity. It covers reserved capacity and nodes, VM and Bare Metal access, Kubernetes and Slurm clusters, SSH keys, storage volumes and GitHub repositories, private networks, monitoring, buying and selling capacity (Reserve, Market, Spot, and Relist), and billing. API keys are scoped to one organization and act with their creator's access there; account, team, and API-key management stay in the console. Most operations require an approved organization. See https://docs.ornn.com/api-keys to create a key and https://docs.ornn.com/guides/kubernetes-api for an end-to-end Kubernetes integration. Examples use fictional IDs and credentials. The info.version field identifies the contract revision, not a shared API path version. contact: email: support@ornn.com servers: - url: https://api.ornn.com description: Production security: - OrnnApiKey: [] tags: - name: Authentication - name: Reservations - name: GPU nodes - name: Clusters - name: Workers - name: Virtual machines description: >- Choose a VM disk, launch VM access on a reservation, and read each VM's status, launch progress, and SSH connection details. - name: Bare Metal description: >- Launch Bare Metal access on a reservation, read a host's readiness and SSH connection details, and reboot or hard reset it. - name: SSH keys description: >- Register public keys for your organization, choose which keys a VM or Bare Metal reservation uses, and queue key delivery to machines. Slurm clusters take organization key IDs at launch. Kubernetes API access does not use SSH keys. - name: Reserve description: >- Browse reserved-capacity listings and their terms, and post, cancel, or accept offers. Reserve listings are visible to approved organizations. - name: Market description: >- Browse relisted capacity and buy windows at the asking price, paid up front. Open to every member of your organization. - name: Spot description: >- Hourly order books for VMs with 1, 2, 4, or 8 GPUs on one node: read books, trades, and quotes, place and cancel bids, and follow fills. - name: Relist description: >- Sell whole nodes from a reservation you hold at your asking price, and manage those listings. - name: Storage description: >- Managed volumes, their files, and GitHub repository pulls. Volumes belong to the API key's creator in the key's organization. - name: Networks description: >- Organization private networks and the WireGuard configs you use to reach private machines and clusters. - name: Monitoring description: >- Machine telemetry and console logs for capacity your organization holds. Reads are limited to your reservation window. - name: Billing description: >- Invoices, billing summary, usage cost, Ornn credits, and account statements. Saving a card and paying invoices stay in the console. externalDocs: description: REST integration walkthrough url: >- https://docs.ornn.com/guides/kubernetes-access#provision-and-manage-through-rest paths: /commerce/reservations/{reservationId}/disk: put: tags: - Virtual machines summary: Choose a VM disk for a reservation description: >- Saves the disk Ornn boots when it creates this reservation's VMs. Saving a disk does not launch anything. You can change the choice until the reservation is activated; after activation the disk is locked. Send null to clear the choice, in which case activation uses your organization's newest disk, or an Ornn disk if your organization has none. Ornn checks that your organization can use the disk when it creates the VM. Bare Metal, Kubernetes, and Slurm reservations do not use a VM disk. operationId: accessSetReservationDisk parameters: - name: reservationId in: path required: true description: Reservation ID. schema: type: string format: uuid example: 11111111-1111-4111-8111-111111111111 requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/AccessReservationDiskRequest' example: vmDiskId: 77777777-7777-4777-8777-777777777777 responses: '200': description: The saved choice. The reservation now carries the disk in vmDiskId. content: application/json: schema: $ref: '#/components/schemas/Reservation' example: reservationId: 11111111-1111-4111-8111-111111111111 customerId: 22222222-2222-4222-8222-222222222222 status: confirmed isSpot: false provisioningType: virtual-machine gpuSlug: h100 gpusPerNode: 8 reservedNodeCount: 1 reservedGpuCount: 8 startsAt: '2026-10-15T00:00:00Z' endsAt: '2026-10-22T00:00:00Z' vmDiskId: 77777777-7777-4777-8777-777777777777 deployedAt: null pendingOperation: null '400': description: The body is not valid JSON or contains an unknown field. content: application/json: schema: $ref: '#/components/schemas/Error' '401': $ref: '#/components/responses/Unauthorized' '403': $ref: '#/components/responses/Forbidden' '409': description: >- The reservation is already activated or has ended, or another reservation operation is pending. content: application/json: schema: $ref: '#/components/schemas/Error' example: detail: code: reservation_disk_locked message: Choose the disk before activating this reservation. '422': description: >- The reservation does not boot a VM disk, or the disk ID is not valid. content: application/json: schema: $ref: '#/components/schemas/Error' example: detail: code: disk_not_supported message: Only virtual machine reservations boot a disk. default: $ref: '#/components/responses/Error' components: schemas: AccessReservationDiskRequest: type: object properties: vmDiskId: type: - string - 'null' format: uuid description: >- An Ornn disk or one of your organization's disks. Null clears the choice. additionalProperties: false Reservation: type: object required: - reservationId - status - isSpot - reservedNodeCount - reservedGpuCount - startsAt - endsAt properties: reservationId: type: string format: uuid customerId: type: string format: uuid listingId: type: string format: uuid listingTermId: type: string format: uuid status: type: string enum: - confirmed - active - completed - cancelled isSpot: type: boolean provisioningType: type: string enum: - virtual-machine - bare-metal - kubernetes - slurm facilityId: type: string format: uuid gpuSlug: type: string gpusPerNode: type: integer reservedNodeCount: type: integer reservedGpuCount: type: integer startsAt: type: string format: date-time endsAt: type: - string - 'null' format: date-time pricePerGpuHourMicroUsd: type: integer format: int64 description: >- Your agreed reservation rate in integer micro-USD per GPU-hour, including any fee you pay. Historical reservations without a saved rate show the linked listing term price. durationHours: type: - number - 'null' description: >- Original agreed duration in hours, separate from operational start and end dates. Renewable reservations retain this duration with a null end date. Null when no duration was agreed. renewable: type: - boolean - 'null' description: Whether the reservation contract permits renewal. downPaymentCents: type: - integer - 'null' format: int64 pendingOperation: type: - string - 'null' pendingOperationId: type: string format: uuid vmDiskId: type: - string - 'null' format: uuid deployedAt: type: - string - 'null' format: date-time endReason: type: - string - 'null' preemptNoticeSeconds: type: - integer - 'null' description: >- Spot and On-demand only. The notice, in seconds, this VM gets before its seller can take its node back, fixed when you bought it. Null for reserved bookings. transactionId: type: string format: uuid createdAt: type: string format: date-time updatedAt: type: string format: date-time relistableNodeCount: type: integer relistUnavailableReason: type: - string - 'null' relistableNodeIds: type: array items: type: string format: uuid Error: type: object properties: code: type: string detail: oneOf: - type: string - type: object required: - code - message properties: code: type: string message: type: string responses: Unauthorized: description: >- The credential is missing, invalid, revoked, or no longer belongs to a current organization member. Check the HTTP status before parsing the body. content: application/json: schema: $ref: '#/components/schemas/Error' Forbidden: description: >- The credential lacks access to this operation, or the organization requires approval. An API key does not bypass these checks. content: application/json: schema: $ref: '#/components/schemas/Error' Error: description: >- Unsuccessful request. Check HTTP status first. Errors may have detail.code/detail.message, a string detail and optional top-level code, or an empty/non-JSON body. 401: invalid credential; 403: access or approval required; 404: not visible or credentials not ready; 409: lifecycle conflict; 429: back off; 5xx: service failure. Inspect current state before retrying mutations. content: application/json: schema: $ref: '#/components/schemas/Error' securitySchemes: OrnnApiKey: type: http scheme: bearer bearerFormat: ornn_sk_... description: >- Create an organization API key in Account Settings > Developer. Do not send this key to the Kubernetes API server. ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.